/* eslint-env browser */
var log = msg => {
  document.getElementById('logs').innerHTML += msg + '<br>'
}

window.createSession = isPublisher => {
  let pc = new RTCPeerConnection({
    iceServers: [
      {
        urls: 'stun:stun.l.google.com:19302'
      }
    ]
  })
  pc.oniceconnectionstatechange = e => log(pc.iceConnectionState)
  pc.onicecandidate = event => {
    if (event.candidate === null) {
      console.log(pc.localDescription);
      document.getElementById('localSessionDescription').value = btoa(JSON.stringify(pc.localDescription))
    }
  }

  if (isPublisher) {
    navigator.mediaDevices.getUserMedia({ video: true, audio: false })
      .then(stream => {
        pc.addStream( stream)
        pc.createOffer()
          .then(d => {pc.setLocalDescription(d)
           url = "http://localhost:8080/sdp"
          d= btoa(JSON.stringify(pc.localDescription))
          $.ajax({
            url:url,
            type:"post",
            dataType:"json",
            data:d,
            headers: {'Content-Type': 'application/json'},
            success: function (sd) {
              pc.setRemoteDescription(new RTCSessionDescription(sd))

            }})
          })
          .catch(log)
      }).catch(log)
  } else {
      pc.addTransceiver('video', {'direction': 'recvonly'})
      pc.createOffer()
          .then(d => {pc.setLocalDescription(d)
        url = "http://localhost:8080/sdp"
        d= btoa(JSON.stringify(pc.localDescription))
        $.ajax({
          url:url,
          type:"post",
          dataType:"json",
          data:d,
          headers: {'Content-Type': 'application/json'},
          success: function (sd) {
            pc.setRemoteDescription(new RTCSessionDescription(sd))

          }})
      })
      .catch(log)

    pc.ontrack = function (event) {
      var el = document.getElementById('video1')
      el.srcObject = event.streams[0]
      el.autoplay = true
      el.controls = true
    }
  }

  window.startSession = () => {
    let sd = document.getElementById('remoteSessionDescription').value
    if (sd === '') {
      return alert('Session Description must not be empty')
    }

    try {
      pc.setRemoteDescription(new RTCSessionDescription(JSON.parse(atob(sd))))
    } catch (e) {
      alert(e)
    }
  }

  let btns = document.getElementsByClassName('createSessionButton')
  for (let i = 0; i < btns.length; i++) {
    btns[i].style = 'display: none'
  }

  document.getElementById('signalingContainer').style = 'display: block'
}
